Re: [RFC][PATCH 14/26] sched, numa: Numa balancer

[Peter Zijlstra]

On Sun, 2012-07-08 at 14:35 -0400, Rik van Riel wrote:
> 
> This looks like something that should be fixed before the
> code is submitted for merging upstream. 

static bool __task_can_migrate(struct task_struct *t, u64 *runtime, int node)
{
#ifdef CONFIG_CPUSETS
        if (!node_isset(node, t->mems_allowed))
                return false;
#endif

        if (!cpumask_intersects(cpumask_of_node(node), tsk_cpus_allowed(t)))
                return false;

        *runtime += t->se.sum_exec_runtime; // @#$#@ 32bit

        return true;
}

static bool process_can_migrate(struct numa_entity *ne, int node)
{
        struct task_struct *p, *t;
        bool allowed = false;
        u64 runtime = 0;

        rcu_read_lock();
        t = p = ne_owner(ne);
        if (p) do {
                allowed = __task_can_migrate(t, &runtime, node);
                if (!allowed)
                        break;
        } while ((t = next_thread(t)) != p);
        rcu_read_unlock();

        /*
         * Don't bother migrating memory if there's less than 1 second
         * of runtime on the tasks.
         */
        return allowed && runtime > NSEC_PER_SEC;
}

is what it looks like..
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